Machine foe riveting boilebs



UNITED STATES PATENT OFFICE.y

S. BENNETT, OF NEW ORLEANS, LOUISIANA.

MACHINE FOR RIVETING BOILERS.

To all whom it may concern:

Be it known that I, S. BENNETT, of the city of New Orleans, in the parish of Orleans and State of Louisiana, have invented a new and useful Improvement in Machinery for Riveting Steam-Boilers and other Articles; and I do hereby delare that the followin is a full, clear, and exact descri tion of t e same, reference being had to t e accompanying drawings, forming part of this specification, in which- Figure l is a perspective view of a steamrivetin machine, with my improvement. Fig. 2 1s a side elevation of the same. Fig. 3 is a front elevation of the same, partly in section. Fig. 4, exhibits side views and central sections of the dies. Fig. 5 exhibits, full size, plans of the heads of a rivet and of the hollow die. Fig. 6 is a section of the riveting lunger or punch, the set, and the anvi, illustrating the operation of the invention.

Similar letters of reference indicate the same parts in all the figures.

In riveting operations it is common to use what is known as a set, consisting of a tool with a hole in it, or in other words, a hollow die, which, after the rivet is put in the holes in the plates and placed with its head. on the anvil or has the riveting stake held against it, is put over the protruding point of the rivet and driven with a hammer to close the plates around the rivet before u settin the oint of the latter to form tllie secon hea This set has always (as far as known to me) been used as a separate tool and held in the hand, and had to be removed before the hammer, punch, or plunger by which the point of the rivet is upset and hammered over the sides of the hole, can be applied. My invention consists in tting the set in the form of a tube to the exterior of a punch or plunger, which is employed to upset the point of and close the rivet, so that it may be employed not only to close the plates together and around the rivet before the riveting commences, but to hold them closed during the riveting operation. The invention is applicable whether the riveting be erformed by steam or other ower.

o enable others skilled in t e art to make and use my invention, I will proceed to describe its construction and operation.

A, A1, are two steam cylinders su ported in line with each other at a short stance apart, upon a heavy goose-neck framing D, D, and fitted each with a piston. The piston-rod B, of the piston within the upper cylinder A1, is solid and works through a stuffing box c, at the bottom of the cylinder, and this rod carries at its extremity the riveting punch F1, which Works opposite to a die a, secured in a stake or anvil horn E, that is secured in the lower part of the framing D, D, said die being of a proper shape to receive the head of the rivet. The pistonrod C, belonging to the piston within the lower cylinder A, is tubular and fits to the exterior of the rod B, and passes rthrough stufling boxes d, d, in the uplper and lower ends of the cylinder. This ollow rod has attached to its lower extremity, the tubular die or set F for closing the plates or other articles to be riveted, upon eachother and around the rivet; said die or set fitting around the riveting punch F1. Each cylinder is provided with a steam chest S containing a valve or valves for the induction and eduction of steam to and from the cylinder, which needs no particular description, as any construction or arrangement of a valve or valves that is suitable for reciproeating steam-engines is applicable. The valve or valves of the up er cylinder are operated to reverse the action o f the piston by means of a hand lever G1, and those of the lower cylinder by means of a hand lever G. The steam chests are su plied with steam from a boiler by pipes P, F, and the exhaust steam escapes by ipes Q, Q.

The operation o riveting is performed as follows z-The f'pistons having been raised by the ressure o steam below them to the to of t eir respective cylinders, and the punc F1 and set F consequently raised, the rivet is inserted in the holes made to receive it and placed with its head upon the die a, and its point u ward, and then the valve lever G of the ower cylinder is moved by an attendant to admit steam above its piston, by which means the set is forced down upon the metal surrounding the rivet with a very heavy ressure; and while the set remains upon t e metal, the valve lever G1 of the upper cylinder is moved to admit steam a ove its piston, which brings down the punch F1 u on the point of the rivet and at once comp etes the operation. The valve levers are then both moved by the attendant to admit steam below their respective istons to force them upward and by t at means the punch F1, and set F, are raised and the rivet enabled to be moved away from the die7 and the machine is brought to a state of readiness to repeat the operation as soon as a new rivet is inserted and placed on the die a.

It is obvious that the interior of the tubular die or set F, must in all cases be larger than the head that is formed on the rivet by the unch F1. This being observed the p11-nc and set may be changed for rivets of dilerent sizes and with dierent shaped heads, and for that purpose they are iittedto screw into their respectivel piston rods or otherwise attached so as tobe capable of removal. The machine may be arranged tov o erate horizontally instead of vertically as s own.

I do not claim, of itself, the employment of a set or tubular punch to close the metal around the rivet before the riveting operation, when such set is un-combined with the riveting punch or other device by which the upsetting or heading up of the rivet is effected, and has to be removed before the said punch or other device can be operated7 as such sets are used in riveting by hand, bu-t What I claim as my invention, and desire to secure by Letters Patent, is:

The employment in combination with a riveting punch or plunger, of a hollow set, iitted to slide upon the exterior of the same,

and o erated to close or set the metalY aroun the rivet before the operation of the punch or plunger commences, and hold the same closed during such operation, substantially as described.

SILVESTER BENNETT.

Witnesses:

IsAAc W. S'PRAGUE, JNO. FRED BRAUN. 

